4.Don’t （犹豫，迟疑）to contact me if you need any more information. 5.The house was surrounded by trees and （看不见的；无形的）from the road. 6.After a (系列) of unsuccessful attempts, he has finally passed the driving test. 7.I cannot say smoking (对……有吸引力) to me very much.

hesitate

invisible

series

appeals